Please see the following thread: https://www.reddit.com/r/PleX/comments/8oh3it/rplexs_moronic_mondays_no_stupid_questions_thread/e05spos/
I’m running into these exact same issues with the android TV app. Likewise I tried it out and also have no problems with other front ends timing out. I can’t let it sit and play all weekend like that person did but seems like the same type of problem. I also recall this started directly after a plex server upgrade on my NAS.